If A - 21- then A-2 - 10-30-

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nCr Definitions and Properties

If A = 21°, t...

Question

If A = 21°, then $\frac{A}{2}$ = 10°30'.

True

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False

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10 \sum j = 0^{30 + j} C_{10 + j} =^{m} C_{20} -^{p} C_{21}

P = 21 (21^{2} - 1^{2}) (21^{2} - 2^{2}) (21^{2} - 3^{2}) . . . (21^{2} - 10^{2})

P

10 \sum j = 0^{30 + j} C_{10 + j} =^{m} C_{20} -^{p} C_{21}

Which of the following is the factorised form of $20 l^{2} m + 30 a l m ?$

p^{2} + q^{2} = 21

p q = 30

(p + q)^{2}

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