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If the system of linear equations x + 2a...

If the system of linear equations `x + 2ay + az = 0`,`x + 3by + bz = 0`,`x + 4cy + cz = 0` has a non-zero solution, then `a, b, c`

A

are in G.P

B

are in H.P

C

satisfy `a + 2b + 3c = 0`

D

are in A.P

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The correct Answer is:
B
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  18. The sum of the series 1/(2!) - 1/(3!) + 1/(4!) - …….. upto infinity is

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