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What should come in place of question mark (?) in the given number series ?13 15 20 37 102 ?
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By: anil on 05 May 2019 01.35 am
let the missing number be x 15 - 13 = 2 20 - 15 = 5 37 - 20 = 17 102 - 37 = 65 y - 102 = z Now, take difference of differences 5-2 = 3 17 -5 =12
65- 17 = 48
Here we can see 12 = 3×4,48=12×4 z-65 = 48 ×4 z = 257 Hence y = 102 + 257 = 359
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65- 17 = 48
Here we can see 12 = 3×4,48=12×4 z-65 = 48 ×4 z = 257 Hence y = 102 + 257 = 359