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Q.

Let E=[13+150]+[13+250]+…+ up to 50 terms, then

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a

E is divisible by exactly 2 primes

b

E is prime

c

E≥30

d

E≤35

answer is B.

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Detailed Solution

For, 1≤x≤33,13<13+x50<1 therefore,[13+x50]=0for1≤x≤33For 34≤x≤50,1<13+x50<43⇒[13+x50]=1 for 34≤x≤50Thus E=17
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