JEE Math Practice Question
Let (1 + x + 2x2)20 = a0 + a1x + a2x2 + .... + a40x40. Then a1 + a3 + a5 + ..... + a37 is equal to
- A.220(220 $$-$$ 21)
- B.219(220 $$-$$ 21)
- C.219(220 $$+$$ 21)
- D.220(220 $$+$$ 21)
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