L&T Company Numerical Ability Arithmetic

If a times the a th term of an AP is equal to b times the b th term, find (a+b) th term.
1] 0 2] a²-b² 3] a-b 4] 1

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L&T Other Question

In how many ways can 21 books on English and 19 books on Hindi be place in a row on a shelf so that two books on Hindi may not be together?
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