4. If "C_1 = 56, “c = 28 and "C+1 = 8, then r is equal to
(a) 8
(b) 6
(c) 5
(d) none of these
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{5! 3!} [/math] * [math]\implies n = 8[/math] * [math]\ implies r-1 = 3 \implies r = 4; n-r+1 = 8–4+1 ... Now solving these two equations we will get r = 6. ... If A:B= 1:2, B:C=3:4, C:D=6:9, D:E=12:16, then A:B:C:D:E is equal to?
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