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Supratim Biswas from DPS RUBY PARK KOLKATA, kolkata
Subject :IMO    Class : Class 7

How many pairs of alternate numbers have a difference of 3 in the given series?
641228742153862171413286

A Five
B Two
C Three
D Four


Ans 1:

Aarushi10 Kataria from Modern High School for Girls, kolkata
Class : Class 8
How ? Please explain.

Ans 2:

Mayank Dahiya from St.Thomas School, JHAJJAR
Class : Class 9
answer is A

Ans 3:

okjnbvfty from mkjhgfcdx, bkgyjthcrgdxf
Class : Class 9
how?

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