Here first term is (a) = 0.4
Common ratios are equal so the given series is in GP.
a4 = a r3 = 0.4×(0.1)3 = 0.0004
a5 = a r4 = 0.4×(0.1)4 = 0.00004
a6 = a r5 = 0.4×(0.1)5 = 0.000004
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