Ans. 120 Directions : (7 to 8) Find the wrong term(s) - Ex 7. 1, 3, 8, 19, 42, 88, 184Sol. Hence, number 88 is wrong and should be replaced by 89. or 1 × 2 + 1, 3 × 2 +2, 8 × 2 + 3, 19 × 2 + 4, 42 × 2 + 5, 89 × + 6 Ans. 88Ex 8. 105, 85, 60, 30, 0, - 45, - 90Sol. 105 - 20 = 85 85 - 25 = 60 60 - 30 = 30 30 - 35 = -5 - 5 - 40 = -45 - 45 - 45 = -90 Hence, number 0 is wrong and should be replaced by -5. Ans. 0 Direction : (9 to 10) In each of following questions, a number series is given. After the series, below it in the next line, a number is given followed by (P), (Q), (R) (S) and (T). You have to complete the series starting with the number given following the sequence of the given series. Then answer the question given below it. Ex 9. 12 28 64 140 37 (P) (Q) (R) (S) (R) Which number will come in place of (T) ? Sol. 12 28 64 140 x32+4 x32+8 x32+12

Download FREE Study Package from & Learn on Video Phone : 0 903 903 7779, 98930 58881 MENTAL ABILITY Class-X Page No. 4Free Remedy Classes for class 10th, Plot No. 27, III- Floor, Zone-2, M.P. NAGAR, Bhopal Similarly (P) (Q) (R) (S) (T) Therefore, the number 1412 will come in place of (E). Ans. 1412 Ex 10. 2 9 57 337 3 (P) (Q) (R) (S) (T) Which number will come in place of (Q) ? Sol. Similarly, (P) (Q) (R) (S) Therefore, the number 113 will come in place of (Q). Ans. 113 ALPHABET SERIES (SERIES OF LETTERS): (a) Pattern of Alphabets Show Variation Based on : (i) Position of the letters (ii) Difference between the alphabets (i) Position of alphabets: Alphabets in order : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Alphabets in reverse order : Z Y X W V U T S R Q P O N M L K J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Direction : (11 to 18) Find the missing term(s) : Ex 11. B, E, H, ? 37 78 164 340 696 1412141214121412 x32+4 x32+8 x32+12 x32+16 x32+20 9 57 337 x38-7 x37-6 x36-5 2 17 113 673 x38-7 x37-6 x36-5 3 3361 x35-4

Download FREE Study Package from & Learn on Video Phone : 0 903 903 7779, 98930 58881 MENTAL ABILITY Class-X Page No. 5Free Remedy Classes for class 10th, Plot No. 27, III- Floor, Zone-2, M.P. NAGAR, Bhopal Sol. In the given series, every letter is moved three steps forward to obtain the corresponding letters of the next term. So, the missing term is K. Ex.12 Q, N, K, ?, E Sol/ In the given series, every letter is moved three steps backward to obtain the corresponding letters of the next term. So, the missing term is H. Ex. 13 CG, DI, ?, IP, MU Sol. The first letter of the first, second, their......terms are moved one, two three, four, five,.....steps forward respectively and the second letters are moved two, three four, five, ......steps forward respectively. So the missing term would be FL. Ex.14.AB, BA, ABD, DBA, PQRS, ? Sol. The first term is reversed to get second term. The third term is reversed to get the fourth term. Similarly , to get the sixth tem, we reverse the fifth term. So, the missing term would be SRQP. Ex.15. 1725, 15X4, 13V3, ?, 9R1 Sol. The first number & second letter of every term is moves steps backward & the third number of every term is moved one step backward. So, the missing term would be 11T2.

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