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ज्ञात कीजिएः (a) 15xx (16) (b) 21 x...

ज्ञात कीजिएः
(a) `15xx (16)`
(b) `21 xx (-32)`
( c) `(-42) xx 12`
(d ) `-55 xx 15`

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7 xx 11 xx 13 xx 15 + 15 is a